Polarized NLO EW e+e− cross section calculations with ReneSANCe-v1.0.0

Abstract

In this paper we present a new Monte Carlo event generator ReneSANCe for simulation of processes at electron–positron colliders. In the current release of the generator the Bhabha scattering (e+e−→e−e+) and Higgs-strahlung (e+e−→ZH) process are implemented. Based on the SANC (Support for Analytic and Numeric Calculations for experiments at colliders) modules, the new generator takes into account complete one-loop and some higher-order electroweak radiative corrections with finite particle masses and polarizations. The new generator effectively operates in the collinear region and at the ZH production threshold. It is constructed in such a way that new processes can be easily added. The paper contains a theoretical description of the SANC approach, numerical validations and manual. Program summary: Program Title: ReneSANCe-v1.0.0 Program Files doi: http://dx.doi.org/10.17632/wp36f7t3ft.1 Licensing provisions: GPLv3 Programming language: Fortran, C, C++ Supplementary material: Looptools [1], FOAM [2] Nature of problem: Theoretical calculations at next-to-leading order in perturbation theory allow to compute higher precision amplitudes for Standard Model processes and decays, provided proper treatments of UV divergences and IR singularities are performed. Solution method: Numerical integration of the precomputed differential expressions for cross sections of certain processes implemented as SANC modules [3,4]. Restrictions: The list of processes is limited to e+e−→e−e+ and e+e−→ZH. References: [1] T. Hahn and M. Perez-Victoria, Comput. Phys. Commun. 118 (1999) 153–165, hep-ph/9807565 [2] S. Jadach, Comput.Phys.Commun. 152 (2003) 55-100, hep-ph/0203033 [3] A. Andonov, A. Arbuzov, D. Bardin, et al., Comput.Phys.Commun. 181 (2010) 305–312, arXiv:0812.4207 [4] D. Bardin et al., Phys. Rev. D 98, 013001, arXiv:1801.00125